Question

what are different theory about origin of life​

Answer 1

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The deep-sea vent theory suggests that life may have begun at submarine hydrothermal vents, spewing key hydrogen-rich molecules. Their rocky nooks could then have concentrated these molecules together and provided mineral catalysts for critical reactions.

Answer 2

The origin of life on Earth is a scientific problem which is not yet solved. There are many ideas, but few clear facts.[1]

Most experts agree that all life today evolved by common descent from a single primitive lifeform.[2] It is not known how this early life form evolved, but scientists think it was a natural process which happened about 3,900 million years ago. This is in accord with the philosophy of naturalism: only natural causes are admitted.

It is not known if metabolism came first or genetics. The main hypothesis which supports genetics first is the RNA world hypothesis, and the one which supports metabolism first is the protein world hypothesis.

Another big problem is how cells developed.[3] Melvin Calvin, winner of the Nobel Prize in Chemistry, wrote a book on the subject,[4] and so did Alexander Oparin.[5] What links most of the early work on the origin of life is the idea that before life began there must have been a process of chemical change.[6] Another question which has been discussed by J.D. Bernal and others is the origin of the cell membrane. By concentrating the chemicals in one place, the cell membrane performs a vital function.[7]